q1 2013 presentation final2

First Quarter 2013 Results May 8, 2013

This presentation may contain “forward-looking” statements within the meaning of Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-looking statements relate to future events or the anticipated performance of the Company and reflect management’s expectations or beliefs regarding such future events and anticipated performance. In certain cases, forward-looking statements can be identified by the use of words such as “plans”, “expects”, “is expected”, “budget”, “scheduled”, ”estimates”, ”forecasts”, ”intends”, ”anticipates” or “believes”, or variations of such words and phrases or statements that certain actions, events or results “may”, ”could”, “would”, ”might”, or “will be taken”, “occur” or “be achieved”, or the negative of these words or comparable terminology. By their very nature forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual performance of the Company to be materially different from any anticipated performance expressed or implied by the forward-looking statements. Such factors include various risks related to the Company’s operations, including, without limitation, fluctuations in spot and forward markets for gold, silver and other metals, fluctuations in currency markets, changes in national and local governments in Mexico and the speculative nature of mineral exploration and development, risks associated with obtaining necessary exploitation and environmental licenses and permits, and the presence of laws that may impose restrictions on mining. A complete list of risk factors are described in the Company’s annual information form and will be detailed from time to time in the Company’s continuous disclosure, all of which are, or will be available, for review on SEDAR at www.sedar.com.

This presentation uses the terms “measured resources”, “indicated resources” and “inferred resources”. The Company advises readers that although these terms are recognized and required by Canadian regulations (under National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI43-101”)), the United States Securities and Exchange Commission does not recognize them. Readers are cautioned not to assume that any part or all of the mineral deposits in these categories will ever be converted in to reserves. In addition, “inferred resources” have a great amount of uncertainty as to their existence, and economic and legal feasibility. It cannot be assumed that all or any part of an inferred mineral resource will ever be upgraded to a higher category. Under Canadian rules, estimates of inferred mineral resources may not form the basis of feasibility or pre-feasibility studies, or economic studies, except for a Preliminary Assessment as defined under NI43-101. Investors are cautioned not to assume that part or all of an inferred resource exists, or is economically or legally mineable.

Although the Company has attempted to identify important factors that could cause actual performance to differ materially from that described in forward-looking statements, there may be other factors that cause its performance not to be as anticipated. The Company neither intends nor assumes any obligation to update these forward-looking statements or information to reflect changes in assumptions or circumstances other than required by applicable law. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those currently anticipated. Accordingly, readers should not place undue reliance on forward-looking statements.

Unless otherwise indicated, all dollar values herein are in US$.

Cautionary Statement

2

Joseph F. Conway President & Chief Executive Officer

Renaud Adams Chief Operating Officer

David Blaiklock Chief Financial Officer

Management Participants

3

Strong Start to 2013

o Record Production Continues

o Strong Earnings and Cash Flow

o Balance Sheet Strengthened

o Expected Higher Annual Silver Sales at Spot Prices

o Increased Reserves and Resources

o San Dimas Expansion On-Track

o Cerro Shareholders Approve Proposed Transaction

o Awarded ESR Distinction

4

Primero Operating Results Q1 2013 Q1 2012

Mill Throughput7

(tonnes per day) 2,042 1,962

Gold equivalent production8

(gold equivalent ounces) 27,656 25,790

Gold production (ounces)

24,190 22,590

Silver production (million ounces)

1.37 1.32

Gold grade (grams per tonne)

4.20 4.05

Silver grade (grams per tonne)

242 242

Cash cost9 ($ per AuEq ounce)

$719 $674

Cash cost9 – by-product ($ per gold ounce)

$589 $532

Capital Expenditures ($ million)

$8.7 $7.9

24,500 25,000 25,500 26,000 26,500 27,000 27,500 28,000

Q1 2012 Q1 2013

Production (AuEq ounces)

Gold Grade (grams per tonne)

3.00

3.50

4.00

4.50

Q1 2012 Q1 2013

+7%

+4%

5 See slide 25 for footnotes.

Primero Financial Results (US$ thousands, except per share amounts)

Q1 2013 Q1 2012

Revenues 46,321 44,044

Income from Mine Operations 15,706 18,662

Net income 17,325 30,143

EPS ($ per share)

0.18 0.34

Adjusted net income10 9,415 18,780

Adjusted EPS ($ per share) 10

0.10 0.21

Operating cash flows before changes in working capital

19,309 20,944

CFPS ($ per share)

0.20 0.24

6 See slide 25 for footnotes.

$42

$43

$44

$45

$46

$47

Q1 2012 Q1 2013

Revenue ($ millions)

+5%

$141M

Balance Sheet March 31, 2013

Cash

Promissory note3

$141 million $32 million

Ownership Goldcorp

Management & insiders Institutional & float

32% ~2%

~66%

Capital Structure March 31, 2013 Shares outstanding Fully Diluted4

Market Cap.

97 million

126 million ~C$660 million

Strong Cash Balance

$120M2

Significant Operating Cash Flow

Conservative Level of Debt

$5M

Repayment per year 3

Primero Capital Structure

See slide 25 for footnotes. 7

Building Primero Value

GOAL

400,000 to 500,000 ounces per year

Americas low-risk regions only

Pipeline of growth projects

Leader in per share growth

8

Building the Primero Pipeline

PRODUCTION

San Dimas Platform

CONSTRUCTION

San Dimas 2,500 TPD

DEVELOPMENT

Cerro Del Gallo

POTENTIAL EXPANSION

San Dimas 3,000 TPD

9

2010-present Q1 2014 2015

110 130

165

205

2012A 2013E 2014E 2015E

Primero Cerro Del GalloSan Dimas Cerro Del Gallo

Estimated Production Profile5,6 (Attributable 000 AuEq ounces)

6

Primero Growth Profile

See slide 25 for footnotes. 10

250 at 3,000 TPD

SAN DIMAS

A Flagship Asset

Location Durango-Sinaloa State Border

Ownership 100%

Metals Gold & Silver

Mining Underground cut and fill and long-hole

DISTRICT PRODUCED 11M OUNCES OF GOLD AND 600M OUNCES OF SILVER

One of Mexico’s Most Significant Precious

Metals Deposits

See Slide 25 for footnotes. 11

Guidance 2013E Gold equivalent production8 (gold equivalent ounces)

120,000-130,000

Gold production (ounces)

90,000-100,000

Silver production11 (million ounces)

6.0-6.5

Silver sales at spot11 (ounces)

900,000-1,000,000

Cash cost9

($ per gold equivalent ounce) $620-640

Cash cost9 – by-product ($ per gold ounce)

$280-300

Capital Expenditures ($ million) $42

Exploration ($ million) $15

-

200

400

600

800

31-Dec-11 31-Dec-12

Increasing Reserves and Resources and Focusing on Controlling Dilution

12

Gold Reserves (Thousand Ounces)

Indicated Gold Resources (Thousand Ounces)

GOLD RESERVES & RESOURCES (Dec. 31, 2012, Mineral Resources include Mineral Reserves)

0.7M 4.5 oz Gold Reserves grams per tonne grade

0.8M 6.5 oz Indicated Gold Resources grams per tonne grade

SILVER RESERVES & RESOURCES11 (Dec. 31, 2012, Mineral Resources include Mineral Reserves)

39M 267 oz Silver Reserves grams per tonne grade

47M 389 oz Indicated Silver Resources grams per tonne grade

SAN DIMAS

Rich History of Reserve Replacement

-

200

400

600

800

31-Dec-11 31-Dec-12

+31%

+35%

See Slide 25 for footnotes.

SAN DIMAS

Expansion to 2,500 TPD12

Total capital expenditure of ~$16.5 million

Expand milling capacity to 2,500 TPD o Install third ball mill, already on-site o Reconfigure crushers o Install new tailings thickener and pumps

Expand mine throughput o Develop Sinaloa Graben veins o Connect Central Block to Sinaloa Graben o New mining method

Future expansion to 3,000 TPD possible o Dependent on exploration success o Minimal capital and disruption to operation

Mill Expansion on-track for: 2,500 TPD

CAPACITY IN Q1 2014

ATTRACTIVE IRR AND PAYBACK PERIOD


TAYOLTITA MINE Mined 1975 - 2002

CENTRAL BLOCK MINE Mined 2002 - Present

SAN ANTONIO MINE Mined 1987 - 2002

Tayoltita Mill

Tunnels

2013 Planned Tunnels

Future Planned Tunnels

Veins

Faults

Ag-Au High Grade Trend

Targets

Mines

Over 120 known veins

CENTRAL BLOCK

TAYOLTITA BLOCK

SINALOA GRABEN BLOCK

WEST BLOCK

ARANA HANGING

WALL

Target

Target

SAN DIMAS

Large 22,500 Hectare Land Package

14

Development o 6,500 metres capitalized

development drifting

o Tunnels joining Sinaloa Graben and Central Block being completed

o Lower level tunnel commenced, expected to be completed in 18-24 months

Exploration o $15.4 million exploration program

o 40,000 metres delineation drilling

o 34,000 metres exploration drilling, plus 3,800 metres of exploration drifting

o New district exploration program initiated

SAN DIMAS

2013: Focused Exploration & Development Targeting Vein Extensions from Existing Mines

15 0 1 2 km

Located in Prolific Central Corridor o Discovered in Q1 2012, included in 2012

year-end Reserves o Mining access within 12 months of discovery

Strategic Underground Drill Locations o Drilling from old El Pilar workings, Sinaloa Graben

tunnel and east-west drift from Robertita

SAN DIMAS

2012 Discoveries in 2013 Mine Plan Significant Opportunity Close to Infrastructure

16

Cerro Del Gallo Acquisition

o Creates a diversified, high growth, competitive cost producer in Mexico with further consolidation opportunities

o Strengthens growth profile and cash flows with estimated production of approximately 260,000 Au Eq. ounces by 201614

o Combined attributable proven and probable reserves of approximately 1.7 million Au Eq. ounces and measured and indicated resources of 3.1 million Au Eq. ounces14

o Strong balance sheet with cash flow sufficient to fund development growth

PRIMERO AND CERRO DEL GALLO

A New Americas Gold Play

18

0.8 0.9 1.2

1.0

2.3

P+P M+I Inferred

Cerro Del Gallo Primero

New Primero Attributable Gold Equivalent Reserves and Resources1,13,14,15


CERRO DEL GALLO

A Revaluation Opportunity Transaction Details o Cerro shareholders to receive 0.023 of a Primero share for each Cerro share and 80.01% in “Spinco” o Transaction value of $125 million as at announcement date December 12, 2012 o Cerro Resources NL shareholder approval meeting April 30, 2013, transaction expected to close in

May 2013

Benefits to Cerro Resources Shareholders o Attractive premium (77% premium to the spot closing price on day prior to announcement) o Significantly improved market presence and liquidity o Valuation re-rating opportunity as the combination diversifies production and cash flows

Benefits to Primero Shareholders o Accretive to Primero on key metrics o Leverages Primero’s regional expertise and solidifies position in Mexico, with further consolidation

opportunities o Diversifies near term production with additional 95,000 AuEq. oz per year o Doubles Reserves and Triples Measured and Indicated Resources6

o Valuation re-rating opportunity as the combination diversifies production and cash flows

19 See Slide 25 for footnotes.

o Open pit, heap leach gold-silver-copper project

o Large resource base relative to reserves

o Excellent local infrastructure in a region known to actively support mining

o Two phased development plan 13

o Phase I heap leach facility with SART metallurgical processing to recover silver and copper

o Commercial Production of Phase I expected in 2015

o Potential future Phase II incorporates Carbon In Leach (CIL) and presents optimization opportunity13

CERRO DEL GALLO

~95,000 AuEq oz per year starting 201513

Technical Overview


Measured & Indicated Resources of 3.2Moz of Gold or 5.6Moz of Gold Equivalent 13,14,15


CERRO DEL GALLO

Large Gold Domain

21

Early stage regional prospecting previously returned16:

o 1.5m @ 590g/t Ag and 3.40g/t Au

o 4.6m @ 428g/t Ag and 3.52g/t Au

o 3.6m @ 359g/t Ag and 1.57g/t Au

o 4.6m @ 239g/t Ag and 1.91g/t Au

o 6.0m @ 243g/t Ag and 1.70g/t Au

o 3.1m @ 200g/t Ag and 1.05g/t Au

o 7.6m @ 168g/t Ag and 1.51g/t Au

Potential Exploration Targets

CERRO DEL GALLO

Exploration Upside Potential

22 See Slide 25 for footnotes.

23

2013 2014 2015 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Detailed Engineering

Geotechnical

Permitting/Land Acquisition

Earth Works

Mill Tests

Acid Generation Tests

SART Optimization

Plant & Mill Construction

Production

Commissioning

Commercial Production

Phase II Feasibility Study Es

timat

ed T

rans

actio

n Cl

osin

g

CERRO DEL GALLO

Cerro Del Gallo Development Plan

23

o San Dimas: A Platform for Cash Generation

o Cerro Del Gallo Acquisition Scheduled to

Close in May 2013

o Cash Flow and Capital to Fund Additional

Growth

o Significant Exploration Potential at San Dimas

and Cerro Del Gallo

o Attractive Valuation on Key Metrics

The Primero Opportunity

19

A Compelling Investment

24

Footnotes 1. Assuming proposed acquisition of Cerro Del Gallo closes in May 2013 as expected. 2. Estimated five-year average after-tax operating cash flow based on production profile discussed in the October 15, 2012 News Release

“Primero Announces Expansion of its San Dimas Mine”. 3. Goldcorp: 5 year, 6% note repaid $5M/yr with balloon payment at end of 2015. Principal prepayment equal to 50% of Excess Free Cash

Flow. 4. Fully diluted shares include 20.8 million warrants with an exercise price of Cdn$8 per share, expiring on July 20, 2015; and 7.8 million

options with an average exercise price of Cdn$5.65. 5. “Gold equivalent ounces” include silver and copper production converted to a gold equivalent based on consensus estimated

commodity prices ; accounts for the San Dimas silver purchase agreement; and uses Cerro Resources publically disclosed production estimates delayed by 12 months.

6. Assumes 100% ownership of Cerro Del Gallo and that it begins production in mid-2015. 7. Based on 365 days per year. 8. “Gold equivalent ounces” include revenue from silver converted to a gold equivalent based on estimated average realized commodity

prices ($1,600 per ounce of gold and $9.41 per ounce of silver in full year 2012, consensus prices thereafter). 9. Cash cost is a non-GAAP measure. Refer to the first quarter 2013 MD&A for a reconciliation of cash costs. 10. Refer to first quarter 2013 MD&A for adjustments. 11. Silver production is subject to a silver purchase agreement. Refer to the first quarter 2013 MD&A for details. 12. See October 15, 2012 News Release “Primero Announces Expansion of its San Dimas Mine” for details. 13. Cerro Resources Phase I Definitive Feasibility Study as of May 2012. 14. As estimated by Cerro Resources using gold, silver and copper price of US$1,341/oz, US$25.58/oz and US$7,582/t (or $3.44/lb)

respectively. See Cerro Resources Phase I Definitive Feasibility Study as of May 2012. 15. See note 7 in January 23, 2012 News Release “ Primero achieves 2012 Guidance and Provides 2013 Outlook. 16. As reported by Cerro Resources in November 16,2012 Investor Presentation:

http://www.cerroresources.com/index.cfm/investor/presentations1/

25

http://www.cerroresources.com/index.cfm/investor/presentations1/

Appendices

Primero sells 50% of annual silver production above 3.5 million ounces at spot

o Remainder sold at ~$4 per ounce under silver purchase agreement

o Threshold commences August 6 to following August 5

o Threshold increases to 6.0 million ounces on August 6, 2014

o Planned expansion anticipated to generate similar silver sales at spot as 2012 post August 6, 2014

Recent Tax Ruling Created Positive Leverage to Silver

25%

75%

Silver as Percentage of 2013E Revenue Silver Gold

SAN DIMAS

Positive Leverage to Silver

27

Joseph F. Conway | President & C.E.O. 1

o Former CEO, President and Director of IAMGOLD from 2003 to 2010

o Former President, CEO and Director of Repadre Capital from 1995 to 2003

Renaud Adams | C.O.O.

o Former SVP, American Operations for IAMGOLD o Former General Manager of Rosebel Gold Mine

2007 to 2010 o Former General Manager El Toqui Mine in Chile

and then the El Mochito Mine in Honduras

David Blaiklock | C.F.O.

o Former controller IntraWest o Previously controller for a number of public and

private companies in real estate development

David Sandison | VP, Corporate Development

o Former VP, Corporate Development of Clarity Capital ; Director, Corporate Development Xstrata Zinc Canada ; Director Business Development, Noranda/Falconbridge;;Former EVP, Noranda Chile

Gabriel Voicu | VP, Geology and Exploration

o 25 Years of mining experience, formerly held senior technical and exploration positions with Cambior and Iamgold

Board Committees: 1.Health, Safety and Environment

Tamara Brown | VP, Investor Relations

o Former Director Investor Relations for IAMGOLD; Partner of a Toronto based, boutique investment bank; Professional engineer in mining industry

H. Maura Lendon | VP, Chief General Counsel and Corporate Secretary

o Former Senior Vice President, Chief Legal Officer and Corporate Secretary of HudBay Minerals Inc.; Chief Counsel Canada, Chief Privacy Officer - Canada of AT&T

Executive Management

28

Board of Directors

Board Committees: 1.Health, Safety and Environment 2. Human Resources and Compensation 3. Governance and Nominating 4. Lead Director 5. Audit

Wade Nesmith | Chairman

o Founder of Primero o Founding and current director

of Silver Wheaton

Joseph Conway | Director1

see Executive Management

David Demers | Director2,3,4,5

o Founder, CEO and Director Westport Innovations

o Director of Cummins Westport and Juniper Engines

Grant Edey | Director 3,5

o President & CEO, Khan Resources Inc.

o Former Director of Breakwater Resources, former director of Queenstake Resources, Santa Cruz Gold

o Former CFO, IAMGOLD

Rohan Hazelton | Director 1,5

o VP, Strategy, Goldcorp o Formerly with Wheaton River

and Deloitte & Touche LLP

Timo Jauristo | Director 2

o EVP, Corporate Development, Goldcorp

o Former CEO of Zincore Metals Inc. and Southwestern Resources Corp.

Eduardo Luna | Director 1

o Former EVP & President, Mexico. Former Chairman and CEO of Silver Wheaton, Executive VP of Goldcorp and Luismin S.A. de C.V. (San Dimas) and President of Mexican Mining Chamber and the Silver Institute

Robert Quartermain | Director 2,3

o Founder and President & CEO, Pretivm Resources

o Former President, Silver Standard o Director of Vista Gold Corp.

and Canplats Resources

Michael Riley | Director 5

o Chartered accountant with more than 26 years of accounting experience

o Chair of Primero Audit Committee, Chair of Audit Committee of B.C. Lottery Corporation and member of the Audit Committee of Canalaska Uranium Ltd.

29

SAN DIMAS

Mineral Resources and Mineral Reserves (DECEMBER 31, 2012, MINERAL RESOURCES INCLUDE MINERAL RESERVES)

Classification Tonnage (million tonnes)

Gold Grade (g/t) Silver Grade (g/ t)

Contained Gold (000 ounces)

Contained Silver (000 ounces)

Mineral Reserves Probable 4.579 4.5 267 660 39,377

Mineral Resources Indicated 3.748 6.5 389 780 46,877 Inferred 6.144 3.9 327 762 64,637

Notes to Mineral Reserve Statement: 1. Cutoff grade of 2.4 grams per tonne (”g/t”) gold equivalent (“AuEq”) based on total operating cost of US$104.73/t. Metal prices assumed are gold US$1,400

per troy ounce and silver US$25 per troy ounce. Silver supply contract obligations have been referenced in determining overall vein reserve estimate viability. 2. Processing recovery factors for gold and silver of 97% and 94% assumed. 3. Exchange rate assumed is 13 pesos/US$1.00. 4. The Mineral Reserve estimates were prepared by Mr. Herbert A. Smith P.Eng. of AMC Mining Consultants (Canada) Ltd. and a QP for the purposes of National

Instrument 43-101 (“NI 43-101”).

Notes to Mineral Resource Statement: 1. Mineral Resources are total and include those resources converted to Mineral Reserves. 2. A 2.0g/t Au Eq cutoff grade is applied and the AuEq is calculated at a gold price of US$1,625 per troy ounce and a silver price of US$25 per troy ounce. 3. A constant bulk density of 2.7 tonnes/m3 has been used. 4. The Mineral Resource estimates were prepared by Mr. Rodney Webster MAusIMM, MAIG and Mr. J. Morton Shannon P.Geo., both of AMC Mining

Consultants (Canada) Ltd. and a QP for the purposes of NI 43-101. Additional exploration potential estimated at 6-10 million tonnes at grade ranges of 3-5 grams per tonne of gold and 200-400 grams per tonne of silver.

It should be noted that these targets are conceptual in nature. There has been insufficient exploration to define an associated Mineral Resource and it is uncertain if further exploration will result in the target being delineated as a Mineral Resource.

30

Phase I Heap Leach (Source: Cerro Resources Definitive Feasibility Study June 2012) Heap Leach Grades 0.69 g/t Au, 14.8g/t Ag, 0.08% Cu Strip Ratio1 0.91

Capital Costs $154 million Operating Costs2 $514/AuEq.oz Phase I Life of Mine (LOM) 7.2 years Phase I Average Annual Production3 94,600 AuEq.oz Permitting To be completed in 2013

CERRO DEL GALLO

Technical Details

1. 9 million tonnes of ‘fresh’ material expected to be mined during Phase I for processing in Phase II. The material has been treated as ‘waste’ material for purposes of calculating the Phase I LOM strip ratio.

2. Cash cost is a non-GAAP measure as estimated by Cerro Resources and include costs for mining, processing, metal transport and refining and administration but do not include capital costs or royalties (4%).

3. Gold equivalent ounces estimated by Cerro Resources include revenue from silver and copper converted to a gold equivalent based three year historic prices as of Definitive Feasibility Study of June 2012, of Gold $1,341/oz, Silver $25.58/oz and Copper $7,582/tonne.

31

Category M Tonnes Au Au Ag Ag Cu Cu Au Eq AuEq (g/t) (M ozs) (g/t) (M ozs) (%) (M lbs) (g/t) (M oz)

Proven 28.2 0.71 0.64 15.1 13.7 0.08 50.2 1.15 1.05 Probable 4.0 0.54 0.07 13.2 1.7 0.07 6.2 0.93 0.12 Proven & Probable 32.2 0.69 0.71 14.8 15.3 0.08 56.4 1.14 1.18


Measured 39.9 0.61 0.78 13.8 17.71 0.10 88.8 1.07 1.37 Indicated 8.0 0.55 0.14 11.0 2.83 0.08 14.6 0.92 0.24 Measured & Indicated 47.9 0.60 0.92 13.3 20.55 0.1 103.4 1.06 1.64

Total Resources Within the Gold Domain2

Phase I Heap Leach In-Pit Proven and Probable Reserves3

In-Pit Resources (excluding Proven and Probable Reserves)4,5


Measured 129 0.54 2.24 12.0 49.8 0.09 256.0 0.94 3.91 Indicated 80 0.38 0.98 8.0 20.6 0.08 141.1 0.69 1.77 Measured & Indicated 209 0.48 3.22 11.0 70.3 0.08 396.9 0.83 5.58 Inferred 20 0.3 0.19 7.0 4.5 0.09 39.7 0.59 0.38

CERRO DEL GALLO

Reserves and In-Pit Resources1

32

1. “Technical Report First Stage Heap Leach Feasibility Study, Cerro del Gallo Gold Silver Project, Guanajuato, Mexico” June 2012 (“Feasibility Study”). Gold equivalent ounces calculated by Cerro Resources using gold, silver and copper prices of US$1,341/oz, US$25.58/oz and US$7,582/t respectively. 2. These resources are reported using internal cut-off grade of 0.2 g/tAu as per Feasibility Study, 2012 and Golder Associates Technical Report, 2008.

3. These reserves are reported using internal cut-off grades of 0.24 and 0.29 gAuEq/t for weathered and partially oxidized, respectively.

4. These resources are reported using internal cut-off grades of 0.24, 0.29, and 0.34 gAuEq/t for weathered, partially oxidized, and fresh material resp. 5. See note 7 in January 23, 2013 News Release “Primero achieves 2012 Guidance and Provides 2013 Outlook”.

Cerro Resources NL (“Cerro”) has filed a technical report under National Instrument 43-101 - Standards of Disclosure for Mineral Projects (“NI 43-101”) entitled “Technical Report, First Stage Heap Leach Feasibility Study, Cerro del Gallo Gold Silver Project, Guanajuato, Mexico” (the “Technical Report”) with an effective date of May 11, 2012. Mr. Gabriel Voicu P.Geo, Vice President, Geology and Exploration, Primero, who is a “qualified person” for the purposes of NI 43-101, has reviewed the Technical Report on behalf of Primero. To the best of Primero’s knowledge, information and belief, there is no new material scientific or technical information that would make the Technical Report inaccurate or misleading. Primero plans to file a technical report on the Cerro Del Gallo project within 180 days of December 13, 2012 in accordance with the requirements of NI 43-101. Cautionary Note to US Investors Regarding Mineral Reporting Standards: Primero prepares its disclosure in accordance with the requirements of securities laws in effect in Canada, which differ from the requirements of US securities laws. Terms relating to mineral resources and mineral reserves in this material change report and other documents referenced herein are defined in accordance with NI 43-101 under the guidelines set out in the Canadian Institute of Mining, Metallurgy, and Petroleum Standards on Mineral Resources and Mineral Reserves. The Securities and Exchange Commission (the “SEC”) permits mining companies, in their filings with the SEC, to disclose only those mineral deposits that a company can economically and legally extract or produce. Primero uses certain terms, such as, “measured mineral resources”, “indicated mineral resources”, “inferred mineral resources” and “probable mineral reserves”, that the SEC does not recognize (these terms may be used in this presentation and other documents referenced herein and are included in the public filings of Primero which have been filed with securities commissions or similar authorities in Canada).

33

CERRO DEL GALLO

Cautionary Statement on Cerro Del Gallo

Notes to Investors Regarding the Use of Resources This presentation has been prepared in accordance with the requirements of Canadian provincial securities laws which differ from the requirements of U.S. securities laws. Unless otherwise indicated, all mineral reserve and resource estimates included in this presentation have been prepared in accordance with Canadian National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI 43-101”) and the Canadian Institute of Mining, Metallurgy and Petroleum classification systems. NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. These standards differ significantly from the requirements of the United States Securities and Exchange Commission (the “SEC”), and reserve and resource estimates disclosed in this presentation may not be comparable to similar information disclosed by U.S. companies. The mineral reserve estimates in this presentation have been calculated in accordance with NI 43-101, as required by Canadian securities regulatory authorities. For United States reporting purposes, SEC Industry Guide 7 under the United States Securities Exchange Act of 1934, as amended, as interpreted by Staff of the SEC, applies different standards in order to classify mineralization as a reserve. As a result, the definition of “probable reserves” used in NI 43-101 differs from the definition in the SEC Industry Guide 7. Under SEC standards, mineralization may not be classified as a “reserve” unless the determination has been made that the mineralization could be economically and legally produced or extracted at the time the reserve determination is made. Among other things, all necessary permits would be required to be in hand or issuance imminent in order to classify mineralized material as reserves under the SEC standards. Accordingly, mineral reserve estimates contained in this presentation may not qualify as “reserves” under SEC standards. In addition, this presentation uses the terms “indicated resources” and “inferred resources” to comply with the reporting standards in Canada. The Company advises United States investors that while those terms are recognized and required by Canadian regulations, the SEC does not recognize them. United States investors are cautioned not to assume that any part or all of the mineral deposits in these categories will ever be converted into mineral reserves. Further, “inferred resources” have a great amount of uncertainty as to their existence and as to whether they can be mined legally or economically. Therefore, United States investors are also cautioned not to assume that all or any part of the “inferred resources” exist. In accordance with Canadian securities laws, estimates of “inferred resources” cannot form the basis of feasibility or other economic studies. It cannot be assumed that all or any part of “indicated resources” or “inferred resources” will ever be upgraded to a higher category or are economically or legally mineable. In addition, disclosure of “contained ounces” is permitted disclosure under Canadian securities laws; however, the SEC only permits issuers to report mineralization as in place tonnage and grade without reference to unit measures. NI 43-101 also permits the inclusion of disclosure regarding the potential quantity and grade, expressed as ranges, of a target for further exploration provided that the disclosure (i) states with equal prominence that the potential quantity and grade is conceptual in nature, that there has been insufficient exploration to define a mineral resource and that it is uncertain if further exploration will result in the target being delineated as a mineral resources, and (ii) states the basis on which the disclosed potential quantity and grade has been determined. Disclosure regarding exploration potential has been included in this presentation. United States investors are cautioned that disclosure of such exploration potential is conceptual in nature by definition and there is no assurance that exploration will result in any category of NI 43-101 mineral resources being identified.

34

Notes

35

Tamara Brown Vice President, Investor Relations T 416 814 3168 [email protected]

Trading Symbols Common Shares TSX:P, NYSE:PPP Warrants TSX:P.WT

PRIMERO MINING CORP. 20 Queen Street West, Suite 2301 Toronto, ON M5H 3R3 T 416 814 3160 F 416 814 3170 TF 877 619 3160 www.primeromining.com

mailto:[email protected]

http://www.primeromining.com/

q1 2013 presentation final2

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